Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24d5ca168dc16d0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-27 10:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ab0bb5f6c095c11640e9e5c9214093 SHA-1: d8500e782fa2868115d30728beca21cfae1075b7 SHA-256: a24d5ca168dc16d0b704bb779e90fc1eac18285a453a65d5810dd74d7bcfae32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://xezojetit.ru/wix?keyword=twitch+r9k+mode', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/wix?keyword=twitch+r9k+mode
    • https://cdn-cms.f-static.net/uploads/4484814/normal_6025cf87b76e9.pdf
    • https://cdn-cms.f-static.net/uploads/4471479/normal_602e09a5b3afc.pdf
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/6e0d177f.pdf
    • https://cdn-cms.f-static.net/uploads/4403543/normal_603169b68cf52.pdf
    • https://cdn-cms.f-static.net/uploads/4489595/normal_600a6cfeb69be.pdf
    • https://zetokefukakebep.weebly.com/uploads/1/3/1/4/131438441/1df8f692a8.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60298b766afea.pdf
    • https://cdn.sqhk.co/lepavenujal/ihijHDS/spanish_game_word_game_vocabulary_games.pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_600c104a79e30.pdf
    • https://cdn-cms.f-static.net/uploads/4413454/normal_6011470697aee.pdf
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fcecefb0f5c1.pdf
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5ffb37d0a78c2.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6034c39b1b298.pdf
    • https://cdn.sqhk.co/kupawusel/nV1hdgi/energy_joensuu_tarjoukset.pdf
    • https://mudatikijamowa.weebly.com/uploads/1/3/1/4/131408537/74e1f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bff6e499-9d10-47c9-b5a3-c5847d484bb3/kidde_smoke_detector_1275_manual.pdf
    • https://uploads.strikinglycdn.com/files/75789829-f708-41d2-972b-994d47d461d9/tom_clancy_the_division_movie_release.pdf
    • https://uploads.strikinglycdn.com/files/5b08a717-0732-40a1-9813-01749f770e2d/dell_inspiron_n5010_core_i3_drivers_free_download.pdf
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_98576a55103841ceb495e3ea6f4b1d07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/79af7803-d066-4910-b49d-06e19544ca41/lepomisuwamogubolavod.pdf
    • https://uploads.strikinglycdn.com/files/6303d468-9f86-4fac-8ce5-64b35b74796d/tuxorov.pdf
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_f87d2e91029a4d369968afbef11d39d1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9e.bin
3c56b10566bdc77a705ca691003c939367f040745ef790ab0102e35188796514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 4700 bytes
font_01_sfnt_off00010fab.bin
07b90f4ea6ed3e23dcfab36fb64123e3bb6b7c51ff1545c52d63613418b1c511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10788 bytes
font_02_sfnt_off000134b5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 4324 bytes

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